linux-kernel - [BUG] fs/f2fs: a possible sleep-in-atomic bug in f2fs_trace

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Date:   Tue, 12 Dec 2017 08:59:29 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     jaegeuk@...nel.org, yuchao0@...wei.com
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] fs/f2fs: a possible sleep-in-atomic bug in f2fs_trace_pid

According to fs/f2fs/trace.c, the kernel module may sleep under a spinlock.
The function call path is:
f2fs_trace_pid (acquire the spinlock)
   f2fs_radix_tree_insert
     cond_resched --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and my code 
review.


Thanks,
Jia-Ju Bai